The County Museum traces the natural, archaeological, social, and geological history of the county.

Dorset County Museum is a museum located in Dorchester, Dorset, England. It was established in 1846 and is one of the oldest county museums in the country. The museum houses collections of archaeology, geology, natural history, fine art, and local history. It also holds a variety of temporary exhibitions and events. The museum has a range of galleries, including the Dorset County Gallery which is home to the museum's fine art collection. It includes works by William Barnes, Thomas Hardy, and Evelyn De Morgan, as well as a number of local artists.

The museum also houses the Geology Gallery, which showcases the county's geology and fossils from the Jurassic Coast. The Natural History Gallery features a range of specimens from the county, including insects, mammals, reptiles, and amphibians. The museum also has a range of interactive displays and activities for visitors to enjoy, such as a fossil hunting game and a virtual reality tour of the county. The museum also offers a range of educational activities, including workshops and activities related to the museum's collections. The museum is open year-round and is free to visit.